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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7521c416bf5890f423029b1d7854bce1281cbe185d430dc694f9c3830bfe9df' 
  AND token = 'OmAmdmj0JuekgCBxgO9ECm7pnvpGLjPUBNFxx3n5KeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}